GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC K Sierra - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E 🢒 Harness Routing Views
Figure 1:

OnStar Component Locations - Typical
Object Number: 623162 Size: MF
(1)Global Positioning Satellite (GPS) Antenna
(2)Cellular Telephone Microphone
(3)Global Positioning System (GPS)
(4)Relay Block - Body
(5)Vehicle Communication Unit (VCU)
(6)OnStar Button Assembly
(7)Vehicle Interface Unit (VIU)
Figure 2:

LH Front of Vehicle - Typical
Object Number: 310802 Size: MF
(1)Upper Radiator Support (Tie Bar)
(2)Headlamp Assembly-LF
(3)Headlamp - High Beam - Left Connector
(4)Daytime Running Lamp (DRL)-Left
(5)Daytime Running Lamp (DRL)-Left Socket
(6)Windshield Washer Reservoir
(7)Park/Turn Signal Lamp Socket-LF
(8)Marker Lamp Socket-LF
(9)Marker Lamp-LF
(10)Park/Turn Signal Lamp-LF
(11)Snowplow (Option) Connector C125
(12)Headlamp Connector-Low Beam-Left
(13)Marker Lamp-LF
Figure 3:

Fuse Block - Underhood
Object Number: 310806 Size: MF
(1)Fuse Block - Underhood Bracket
(2)Inflatible Restraint Harness
(3)Radiator Support
(4)C103 -I/P Harness Side
(5)C103 -Forward Lamp Harness Side
(6)LH Battery Tray
(7)Fuse Block - Underhood Bracket
(8)Fuse Block - Underhood
Figure 4:

C100, C102 and C152
Object Number: 413351 Size: MF
(1)C102
(2)Fuse Block - Underhood Support Mount
(3)C152
(4)C100
Figure 5:

C104, C114, C150, C151, C153, C154, and PTO Relay
Object Number: 814636 Size: LF
(1)Fuse Block - Underhood
(2)C153 - Engine Harness to Transfer Case Harness
(3)C150 - Transfer Case Harness to Axle Jumper Harness
(4)Transfer Case Harness
(5)C151 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C104 - I/P Harness to Forward Lamp Harness (w/o NP8/NR4)
(6)C154 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C114 - Chassis Harness to I/P Harness (w/JL4/NYS)
(7)Power Take-Off (PTO) Relay
Figure 6:

Primary Negative Battery Ground and G105 (6.6L)
Object Number: 768351 Size: MF
(1)Engine - 6.6L Diesel
(2)Primary Negative Battery Cable
(3)Primary Negative Battery Ground
(4)G105
(5)Engine Harness
Figure 7:

Left Side of the Engine (LB7)
Object Number: 1403191 Size: LF
(1)Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(2)A/C Compressor Clutch Connector
(3)Coolant Level Switch Connector
(4)Generator - Left Connector
(5)A/C Refrigerant Pressure Sensor Connector
(6)Generator - Right Connector
(7)C107
(8)A/C Low Pressure Switch Connector
(9)C108
(10)S102
(11)PTO Relay
(12)Glow Plug Controller Power
(13)Throttle Actuator Control (TAC) Module Connector
(14)Automatic Transmission Input Shaft Speed (AT ISS) Sensor Connector
(15)Automatic Transmission Turbine Speed Sensor Connector
(16)C145
(17)Automatic Transmission Output Speed Sensor Connector
(18)Park/Neutral Position (PNP) Switch Connector
(19)C100
(20)Fuse Block - Underhood C2
(21)C152
(22)C106
(23)S103
(24)G104
(25)Engine Control Module (ECM) C1
(26)Engine Control Module (ECM) C2
(27)Transmission Control Module (TCM) C1
(28)Transmission Control Module (TCM) C2
(29)S163
Figure 8:

Lower Right Side of the Engine (6.6L)
Object Number: 768355 Size: MF
(1)Engine - 6.6L Diesel
(2)Engine Harness
(3)G102
(4)Auxiliary Negative Battery Ground
(5)Starter Relay Terminal
(6)Starter Solenoid
Figure 9:

C201 and A/T Shift Lock Control Connector
Object Number: 310109 Size: MF
(1)Inline Connector C201
(2)Inline Connector C201
(3)Inflatable Restraint Harness
(4)Inflatable Restraint Electrical Connector
(5)Body Control Module (BCM) Bracket
(6)Body Control Module (BCM) Harness
(7)A/T Shift Lock Control Solenoid Connector
(8)A/T Shift Lock Control Solenoid Electrical Connector
(9)Lower Steering Column Shaft
(10)Inflatable Restraint Steering Wheel Module Connector with Tether
(11)Instrument Panel Bracket
Figure 10:

Instrument Cluster
Object Number: 310124 Size: MF
(1)Instrument Panel Cluster (IPC)
(2)Inline Connector C202 M
(3)Inline Connector C202 F
(4)Instrument Cluster Electrical Connector
(5)Instrument Panel Carrier
(6)Instrument Panel
Figure 11:

Instrument Panel
Object Number: 894047 Size: LF
(1)C104 (YE9)
(2)C106 (PTO)
(3)Fuse Block Underhood - C1
(4)C115 (NYS)
(5)C105 (LB7)
(6)S214 (NP8)
(7)S202
(8)P110
(9)S213
(10)S205
(11)C222 (Except HP2)
(12)C209 (Z55 or E52)
(13)C306
(14)C249
(15)S210 (UQ7 and Y91)
(16)C201
(17)S218
(18)C221
(19)C206 (Y91 or HP2)
(20)S212 (NYS)
(21)P100
(22)C154 (NP1 or NP8)
(23)C102
Figure 12:

Left Front Door
Object Number: 894588 Size: LF
(1)Fuse Block Left I/P - C3
(2)P500
(3)C313
Figure 13:

Right Front Door
Object Number: 894609 Size: LF
(1)Fuse Block Right I/P - C7
(2)Fuse Block Right I/P - C2
(3)S601
(4)C315
(5)P600
Figure 14:

Chassis Wiring Harness to Front Frame -25 Series
Object Number: 615810 Size: MF
(1)Shock Absorber Solenoid-LF Connector
(2)Wheel Speed Sensor (WSS)-LF Connector
(3)Wheel Speed Sensor (WSS)-LF Connector
(4)Suspension Position Sensor-LF Connector
(5)Suspension Position Sensor-LF Connector
(6)Chassis Harness
(7)Shock Absorber Solenoid-RF Connector
(8)Shock Absorber Solenoid-RF Connector
(9)Suspension Position Sensor-RF Connector
(10)Frame
Figure 15:

HVAC Module Assembly Connections, C296 and G200
Object Number: 310004 Size: MF
(1)Recirculation Actuator Connector
(2)Instrument Panel
(3)Electrical Harness Connector
(4)G200
(5)Blower Motor Resistor Assembly
(6)Blower Motor Resistor Connector
(7)C296
(8)Air Temperature Actuator Connector
(9)Air Temperature Actuator
(10)Mode Actuator
Figure 16:

Headliner Harness to Relay I/P - Body
Object Number: 623107 Size: MF
(1) A - Pillar
(2)Headliner Wiring Harness
(3)Relay Block - I/P
(4)Headliner Harness Connector C-6
Figure 17:

C200 and C204
Object Number: 310055 Size: MF
(1)C200 -I/P Harness Side
(2)C204
(3)A-Pillar
(4)C200 -Door Harness Side
Figure 18:

Lower RF of the Passenger Compartment
Object Number: 926689 Size: MF
(1)C222
(2)Body Harness
Figure 19:

C210 and Relay Block - I/P - C4
Object Number: 814939 Size: LF
(1)Relay Block - I/P
(2)Relay Block - I/P - C4
(3)C210 - Roof Beacon Relay Inline
Figure 20:

C304 and C299
Object Number: 656720 Size: MF
(1)Fuse Block - Right I/P
(2)Fuse Block - Right I/P- C2
(3)RF Door Harness
(4)C304
(5)C299
Figure 21:

LH Rear of Passenger Compartment
Object Number: 309982 Size: MF
(1) Side Inner Body Panel - LH
(2)Panel Access Hole
(3) Speaker - LR Connector
(4)Speaker - LR Connector
(5)Body Wiring Harness
(6)Body Wiring Harness
(7)Rear Glass -Defogger Grid Not Shown
(8)Rear Defogger Grid Connector
(9)Rear Defogger Grid Connector
Figure 22:

Driver/Passenger Power Seat Wiring -C301, C305 and C399
Object Number: 656608 Size: MF
(1)C305
(2)C399
(3)Power Seat Wiring Harness to Heated Seat Switch
(4)C301
Figure 23:

Driver Seat (w/Memory -- 1 of 2)
Object Number: 784811 Size: MF
(1)Inline Connector C324
(2)Memory Seat Module-C2
(3)Memory Seat Module-C1
(4)Memory Seat Module
(5)Inline Connector C321
(6)Inline Connector C320
(7)Memory Seat Module-C3
(8)Positive Temperature Coefficient (PTC) Thermistor
(9)Inline Connector C305
(10)Inflatible Restraint Side Impact Sensor (SIS) - Left Connector
(11)Inline Connector C323
(12)Inline Connector C325
(13)Inline Connector C322
(14)Heated Seat Relay and Logic
(15)Seat Belt Switch Connector
(16)Seat Heater Element Connector